Abstract: A battery holder includes restriction members protruded from a holding base plate in an axial direction of batteries to be located in spaces between the batteries. Each of the restriction members has: a tapered surface which is inclined to the axial direction and is in line contact with an outer periphery of the end face of the battery when the restriction member is inserted into the space, so as to apply a force to move the battery in a radial direction of the battery; and a support surface which supports a side face of the battery that is not in contact with the tapered surface, by surface contact. The support surface receives a moving force in the radial direction from the tapered surface and supports the side face of the battery by a reactive force.

Abstract: A battery device includes a bus bar having a coupling bus bars, a positive electrode bus bar and a negative electrode bus bar. The coupling bus bar includes: a positive electrode connection member arranged to sequentially connect positive electrode terminals of the respective batteries included in one battery array group; and a negative electrode connection member arranged to sequentially connect negative electrode surfaces of the respective batteries included in another battery array group. The positive electrode connection member is electrically connected with the negative electrode connection member. The positive electrode bus bar is arranged to sequentially connect specific positive electrode terminals in a specific battery array group, which are not connected by the coupling bus bar. The negative electrode bus bar is arranged to sequentially connect specific negative electrode terminals in a specific battery array group, which are not connected by the coupling bus bar.

Abstract: A battery holder holds a plurality of batteries by a simple structure. A battery holder 20 has a holder member 40 to hold batteries Bt. The holder member 40 includes a holder body 42 provided as a plate-like member, and holding holes 40S. The holding hole 40S is formed, such that a holding space 40Sa is secured between the inner wall of the holding hole 40S and the side face of the battery Bt. The holder member 40 has pressing projections 42a, each being formed by pressing and plastically deforming part of the holder body 42 toward an axial direction of the battery and formed by protruding part of the inner wall of the holding hole 40S toward the center of the battery. The pressing projections are arranged, such as to press the side face of the battery Bt and hold the battery Bt in the holder member 40.

Abstract: A battery holder includes restriction members protruded from a holding base plate in an axial direction of batteries to be located in spaces between the batteries. Each of the restriction members has: a tapered surface which is inclined to the axial direction and is in line contact with an outer periphery of the end face of the battery when the restriction member is inserted into the space, so as to apply a force to move the battery in a radial direction of the battery; and a support surface which supports a side face of the battery that is not in contact with the tapered surface, by surface contact. The support surface is configured to receive a moving force in the radial direction from the tapered surface and support the side face of the battery by a reactive force.